Citation:
Chen Yiyong, Mao Weihong, Wang Naidong. ADSORPTION AND ADSORPTION MECHANISM OF 4-AMINO-1,2,4-TRIAZOLE RESIN FOR Cr(VI)[J]. Chinese Journal of Applied Chemistry,
;1992, 9(6): 31-35.
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Cr(Ⅵ) was quantitatively adsorbed by 4-amino-1,2,4-triazole resin(4-ATR) in a medium of pH=1,but Cr3+ almost could not be adsorbed. The separation coefficient βCr(Ⅵ)/Cr3+ is as high as 5.52×103. The statically saturated sorption capacity is 179.4mg Cr(Ⅵ)/gresin[3.45 mmol Cr(Ⅵ)/g resin]. Cr(Ⅵ) adsorbed on 4-ATR can be reductively eluated by 5mol/L HCL. The sorption rate constants determined under various temperatures were k21℃=1.59×1O-3S-1,k25℃=1.87×10-3S-1 and k30℃=2.2×10-3S-1,respectively. The apparent activation energy of sorption E2 is 26.26kJ/mol.The thermodynamic parameters of sorption,enthalpy ΔH298,freeenergy ΔG298,and entropy ΔS298 of sorption (4-ATR) for Cr(Ⅵ) are 86.16, -15.1 kJ/mol,and 339.8 J/mol·Κ,respectively.Coordination molar ratio of Cr(Ⅵ)to -NH-H???19920607??? is 1:1. The sorption mechanism shows that the nitrogen atoms of the functional group of 4-ATR coordinated with Cr(Ⅵ) to form coordination bond. The 4-ATR can be used in the separation of Cr(Ⅵ) from the waste electroplating water. The percentage of recovery of chromium is 95.7.%., Cr(Ⅵ) was quantitatively adsorbed by 4-amino-1,2,4-triazole resin(4-ATR) in a medium of pH=1,but Cr3+ almost could not be adsorbed. The separation coefficient βCr(Ⅵ)/Cr3+ is as high as 5.52×103. The statically saturated sorption capacity is 179.4mg Cr(Ⅵ)/gresin[3.45 mmol Cr(Ⅵ)/g resin]. Cr(Ⅵ) adsorbed on 4-ATR can be reductively eluated by 5mol/L HCL. The sorption rate constants determined under various temperatures were k21℃=1.59×1O-3S-1,k25℃=1.87×10-3S-1 and k30℃=2.2×10-3S-1,respectively. The apparent activation energy of sorption E2 is 26.26kJ/mol.The thermodynamic parameters of sorption,enthalpy ΔH298,freeenergy ΔG298,and entropy ΔS298 of sorption (4-ATR) for Cr(Ⅵ) are 86.16, -15.1 kJ/mol,and 339.8 J/mol·Κ,respectively.Coordination molar ratio of Cr(Ⅵ)to -NH-H
3+ almost could not be adsorbed. The separation coefficient βCr(Ⅵ)/Cr3+ is as high as 5.52×103. The statically saturated sorption capacity is 179.4mg Cr(Ⅵ)/gresin[3.45 mmol Cr(Ⅵ)/g resin]. Cr(Ⅵ) adsorbed on 4-ATR can be reductively eluated by 5mol/L HCL. The sorption rate constants determined under various temperatures were k21℃=1.59×1O-3S-1,k25℃=1.87×10-3S-1 and k30℃=2.2×10-3S-1,respectively. The apparent activation energy of sorption E2 is 26.26kJ/mol.The thermodynamic parameters of sorption,enthalpy ΔH298,freeenergy ΔG298,and entropy ΔS298 of sorption (4-ATR) for Cr(Ⅵ) are 86.16, -15.1 kJ/mol,and 339.8 J/mol·Κ,respectively.Coordination molar ratio of Cr(Ⅵ)to -NH-H
is 1:1. The sorption mechanism shows that the nitrogen atoms of the functional group of 4-ATR coordinated with Cr(Ⅵ) to form coordination bond. The 4-ATR can be used in the separation of Cr(Ⅵ) from the waste electroplating water. The percentage of recovery of chromium is 95.7.%., Cr(Ⅵ) was quantitatively adsorbed by 4-amino-1,2,4-triazole resin(4-ATR) in a medium of pH=1,but Cr3+ almost could not be adsorbed. The separation coefficient βCr(Ⅵ)/Cr3+ is as high as 5.52×103. The statically saturated sorption capacity is 179.4mg Cr(Ⅵ)/gresin[3.45 mmol Cr(Ⅵ)/g resin]. Cr(Ⅵ) adsorbed on 4-ATR can be reductively eluated by 5mol/L HCL. The sorption rate constants determined under various temperatures were k21℃=1.59×1O-3S-1,k25℃=1.87×10-3S-1 and k30℃=2.2×10-3S-1,respectively. The apparent activation energy of sorption E2 is 26.26kJ/mol.The thermodynamic parameters of sorption,enthalpy ΔH298,freeenergy ΔG298,and entropy ΔS298 of sorption (4-ATR) for Cr(Ⅵ) are 86.16, -15.1 kJ/mol,and 339.8 J/mol·Κ,respectively.Coordination molar ratio of Cr(Ⅵ)to -NH-H
is 1:1. The sorption mechanism shows that the nitrogen atoms of the functional group of 4-ATR coordinated with Cr(Ⅵ) to form coordination bond. The 4-ATR can be used in the separation of Cr(Ⅵ) from the waste electroplating water. The percentage of recovery of chromium is 95.7.%.
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Keywords:
- aminotriazole,
- chromium ion,
- adsorption
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